Science major Dexter Riley (Kurt Russell) and his buddies Schuyler (Michael McGreevey) and Debbie (Joyce Menges) create a spray that makes one appear to be invisible. Desperate to get his hands on the formula is A.J. Arno (Cesar Romero), whose ultimate plan is to use the serum to rob a bank. Soon, Dexter and company find themselves in a dangerous predicament, as it seems every crook in town is out to pilfer the magic liquid.